/*

 * PowerPC implementation of KVM hooks

 *

 * Copyright IBM Corp. 2007

 *

 * Authors:

 *  Jerone Young <jyoung5@us.ibm.com>

 *  Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>

 *  Hollis Blanchard <hollisb@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 */

#include <sys/types.h>

#include <sys/ioctl.h>

#include <sys/mman.h>

#include <linux/kvm.h>

#include "qemu-common.h"

#include "qemu-timer.h"

#include "sysemu.h"

#include "kvm.h"

#include "kvm_ppc.h"

#include "cpu.h"

#include "device_tree.h"

//#define DEBUG_KVM

#ifdef DEBUG_KVM

#define dprintf(fmt, ...) \

    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)

#else

#define dprintf(fmt, ...) \

    do { } while (0)

#endif

int kvm_arch_init(KVMState *s, int smp_cpus)

{

    return 0;

}

int kvm_arch_init_vcpu(CPUState *cenv)

{

    return 0;

}

int kvm_arch_put_registers(CPUState *env)

{

    struct kvm_regs regs;

    int ret;

    int i;

    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);

    if (ret < 0)

        return ret;

    regs.ctr = env->ctr;

    regs.lr  = env->lr;

    regs.xer = env->xer;

    regs.msr = env->msr;

    regs.pc = env->nip;

    regs.srr0 = env->spr[SPR_SRR0];

    regs.srr1 = env->spr[SPR_SRR1];

    regs.sprg0 = env->spr[SPR_SPRG0];

    regs.sprg1 = env->spr[SPR_SPRG1];

    regs.sprg2 = env->spr[SPR_SPRG2];

    regs.sprg3 = env->spr[SPR_SPRG3];

    regs.sprg4 = env->spr[SPR_SPRG4];

    regs.sprg5 = env->spr[SPR_SPRG5];

    regs.sprg6 = env->spr[SPR_SPRG6];

    regs.sprg7 = env->spr[SPR_SPRG7];

    for (i = 0;i < 32; i++)

        regs.gpr[i] = env->gpr[i];

    ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);

    if (ret < 0)

        return ret;

    return ret;

}

int kvm_arch_get_registers(CPUState *env)

{

    struct kvm_regs regs;

    uint32_t i, ret;

    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);

    if (ret < 0)

        return ret;

    env->ctr = regs.ctr;

    env->lr = regs.lr;

    env->xer = regs.xer;

    env->msr = regs.msr;

    env->nip = regs.pc;

    env->spr[SPR_SRR0] = regs.srr0;

    env->spr[SPR_SRR1] = regs.srr1;

    env->spr[SPR_SPRG0] = regs.sprg0;

    env->spr[SPR_SPRG1] = regs.sprg1;

    env->spr[SPR_SPRG2] = regs.sprg2;

    env->spr[SPR_SPRG3] = regs.sprg3;

    env->spr[SPR_SPRG4] = regs.sprg4;

    env->spr[SPR_SPRG5] = regs.sprg5;

    env->spr[SPR_SPRG6] = regs.sprg6;

    env->spr[SPR_SPRG7] = regs.sprg7;

    for (i = 0;i < 32; i++)

        env->gpr[i] = regs.gpr[i];

    return 0;

}

int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)

{

    int r;

    unsigned irq;

    /* PowerPC Qemu tracks the various core input pins (interrupt, critical

     * interrupt, reset, etc) in PPC-specific env->irq_input_state. */

    if (run->ready_for_interrupt_injection &&

        (env->interrupt_request & CPU_INTERRUPT_HARD) &&

        (env->irq_input_state & (1<<PPC40x_INPUT_INT)))

    {

        /* For now KVM disregards the 'irq' argument. However, in the

         * future KVM could cache it in-kernel to avoid a heavyweight exit

         * when reading the UIC.

         */

        irq = -1U;

        dprintf("injected interrupt %d\n", irq);

        r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);

        if (r < 0)

            printf("cpu %d fail inject %x\n", env->cpu_index, irq);

    }

    /* We don't know if there are more interrupts pending after this. However,

     * the guest will return to userspace in the course of handling this one

     * anyways, so we will get a chance to deliver the rest. */

    return 0;

}

int kvm_arch_post_run(CPUState *env, struct kvm_run *run)

{

    return 0;

}

static int kvmppc_handle_halt(CPUState *env)

{

    if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {

        env->halted = 1;

        env->exception_index = EXCP_HLT;

    }

    return 1;

}

/* map dcr access to existing qemu dcr emulation */

static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)

{

    if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)

        fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);

    return 1;

}

static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)

{

    if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)

        fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);

    return 1;

}

int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)

{

    int ret = 0;

    switch (run->exit_reason) {

    case KVM_EXIT_DCR:

        if (run->dcr.is_write) {

            dprintf("handle dcr write\n");

            ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);

        } else {

            dprintf("handle dcr read\n");

            ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);

        }

        break;

    case KVM_EXIT_HLT:

        dprintf("handle halt\n");

        ret = kvmppc_handle_halt(env);

        break;

    }

    return ret;

}